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2013年1月18日星期五

Causes of Pulmonary Edema in Renal Failure

Pulmonary edema is a common symptom of Renal Failure. For people with server
pulmonary edema, they may suffer from difficulty in breath, cough and even can
not lie down. So, why people with Renal Failure have pulmonary edema?

1. High blood pressure and severe anemia
High blood pressure can cause much burden to heart. If uncontrolled, high
blood pressure is very likely to cause acute pulmonary edema.
Anemia in Renal Failure is attributable to reduced production of EPO and iron
insufficiency and the blood loss. Long-term anemia can cause myocardial ischemia
thus causing pulmonary edema.

3. Excess fluid in body
People with Renal Failure usually have excess fluid in body due to excess
intakes of fluid and sodium. In advanced stage of Renal Failure, many people may
suffer from oliguria and even anuria. At the intervals of dialysis, if they have
too much fluid intake or have inadequate dialysis, it will cause fluid retention
thus resulting in acute pulmonary edema.

4. Uremic toxins in body
If the patients with Renal Failure do not have adequate dialysis, a mass of
uremic toxins will build up in body, which can elevate the permeability of
pulmonary capillaries. As a result, the wedge pressure of the pulmonary
capillaries rises thus resulting in pulmonary edema.

5. Arteriovenous fistula
If the arteriovenous fistula is too big, it will cause excess blood flow thus
putting much burden on heart. Hence, the patients with Renal Failure are very
likely to develop pulmonary edema.

To avoid pulmonary edema, the patients with Renal Failure should take
relevant measure according to the above causes including controlling body weight
and high blood pressure, correcting anemia, avoid hemolysis, correct
hypoproteinemia etc.

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